Compressed air energy storage power stations are a new type of electrical energy storage system with advantages such as fast dynamic response, high economic performance, and low environmental pollution. They can play a role in load balancing, strategic planning, and improving power supply quality. Their economic benefits can be divided into two parts: static benefits and dynamic benefits.
Compressed air energy storage power stations utilize excess electrical energy generated during periods of low load in the power system to compress and store air in underground caverns. When needed, the compressed air is released, heated, and used to generate electricity via a gas turbine generator set to meet peak load demands. The energy supplied to the gas turbine is the sum of the potential energy of the compressed air and the chemical energy of the fuel used to heat the air. In one charge-and-release cycle, the electricity generated by a compressed air energy storage power station exceeds the amount of electricity required for charge-and-release.
I. Working principle of compressed air energy storage power station:
Compressed air energy storage power stations are a type of energy storage technology. The principle is based on using electricity to compress and store air. When energy needs to be released, the compressed air is released to drive a turbine generator to generate electricity.
Gas storage stage: During off-peak periods, electricity is used to drive electric motors to extract and compress air from the atmosphere and store it in high-pressure gas storage facilities, usually underground reservoirs or underground caverns.
Power generation stage: During peak demand periods, compressed air in the gas storage tank is depressurized and expanded through combustion or mixing with natural gas to drive a turbine generator to produce electricity.
II. The advantages of compressed air energy storage power stations include:
Large energy storage capacity: The storage capacity can be adjusted according to demand, which can meet the instantaneous or long-term energy storage needs of the power grid.
Highly dispatchable: Compressed air energy storage power stations can be quickly started and stopped according to grid demand, providing flexible energy output and helping to cope with power grid fluctuations and peak demand.
High efficiency: Compressed air energy storage power stations can achieve high energy conversion efficiency. Energy loss is relatively low during energy storage and release.
Leveraging existing infrastructure: Compressed air energy storage power stations can be integrated with existing power systems and transmission networks, making full use of existing transmission lines and power equipment.
Environmental protection and sustainability: Compressed air energy storage power stations use air as the energy storage medium, which does not produce greenhouse gas emissions or environmental pollution, and can be combined with renewable energy to improve energy sustainability.
Due to its flexibility and environmental friendliness, compressed air energy storage power plants are considered a promising energy storage solution that can help achieve the efficient use of renewable energy and the stability of the power system.
